There was Wavespeaker Valoren in Vashj'ir as well who plays a pretty big role in the Shimmering Expanse. Plus later on we have the recurring character of Earthcaller Yevaa in Deepholme and Twilight Highlands.
Overall, I just think it's disingenuous to complain about their lack of involvement in the story while at the same time coming up with reasons to discount their involvement in Cataclysm. Shamanism is very much part of Draenei culture whether you want it to be or not, and in Cataclysm was a very Shaman-centric expansion.
Now I do agree that they might be past due for some more lore, but I don't see any point in making things out to be worse then they actually are.